Author: Ren Wu
Date: 22:07:42 01/24/01
Go up one level in this thread
Thanks Bob, for this is a interesting post. On January 24, 2001 at 23:39:12, Robert Hyatt wrote: >In the following test, I varied each of the 5 extensions in five steps, >0.0, 0.25, 0.5, 0.75 and 1.0. I treated each extension as an independent >test, that is I did not run 5^5 test cases, Actually 5^5 cases is even more intresting, can you, or will you do this in the future? >recapture is the most interesting case. It actually appears that removing >this _completely_ gave the best score, which is surprising since >win at chess is a tactical suite. Lowering this extension obviously >speeds up the overall search. I currently use .75 here as well. >The most interesting thing is the recapture extension. I have used it forever, >and took the idea from Cray Blitz since I used it there as well. I am not yet >sure why it actually hurts since it seems (to me) to be a logical idea. I am >going to test this more, just for my own interest. I never found recapture extension worthwhile in my program. However, i was more depend on testsuite, not the games, so i am not sure if this can have any benefit in real games. Maybe you can try giving lost captures minus extension (prune) and see what happens? I used to think that fast computer will help more on extensions, but now i am almost want to think in other ways around, that is, doing more prune likily probably better than extends. Ren.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.